Yolo-Solano AQMD

Adopted November 10, 2010 Reg. II, Rule 2.43, Page 1

RULE 2.43 BIOMASS BOILERS

Adopted (November 10, 2010)

INDEX

100 GENERAL

101 PURPOSE

102 APPLICABILITY

110 EXEMPTIONS

200 DEFINITIONS

201 BIOMASS

202 BIOMASS FUELED BOILER (BOILER)

203 BLOCK 24-HOUR AVERAGE

204 BRITISH THERMAL UNIT (BTU)

205 CARBON MONOXIDE (CO) EMISSIONS

206 CURING STARTUP

207 HEAT INPUT

208 HIGHER HEATING VALUE (HHV)

209 NITROGEN OXIDE (NOx) EMISSIONS

210 RATED HEAT INPUT

211 SHUTDOWN

212 STARTUP

213 UNIT

300 STANDARDS

301 EMISSION LIMITS

302 STARTUP/SHUTDOWN PROVISIONS

303 CONTINUOUS EMISSION MONITORING SYSTEM (CEMS)

304 SOURCE TESTING

400 ADMINISTRATIVE REQUIREMENTS

401 COMPLIANCE SCHEDULE

402 CEMS OPERATING AND MAINTENANCE PLAN

500 REPORTING AND RECORDKEEPING

501 REPORTING

502 RECORDKEEPING

600 TEST METHODS

601 GENERAL

602 NOx EMISSION CONCENTRATION
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603 CO EMISSION CONCENTRATION

604 STACK GAS OXYGEN

605 STACK GAS VELOCITY (FLOW)

606 STACK GAS MOISTURE CONTENT

607 FUEL HHV
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100 GENERAL

101 PURPOSE: The purpose of this rule is to limit the emissions of oxides of

nitrogen(NOx) and carbon monoxide (CO) from biomass fueled boilers.

102 APPLICABILITY: The provisions of this rule are applicable to boilers and steam

generators with rated heat inputs of greater than or equal to 5 million BTU per hour

and which combust biomass as a fuel.

110 EXEMPTIONS: The provisions of this rule shall not apply to the following:

110.1 Boilers, Steam Generators, and Process heaters: Boilers, steam generators,

and process heaters which are subject to the provisions of District Rule 2.27 -

Industrial, Institutional, and Commercial Boilers, Steam Generators, and

Process Heaters.

110.2 Solid Waste Incinerators: Combustion units whose primary purpose is to

burn municipal solid waste.

110.3 Waste Heat Recovery Boilers: Waste heat recovery boilers that are used to

recover sensible heat from the exhaust of combustion turbines or unfired

waste heat recovery boilers used to recover sensible heat from the exhaust of

any combustion equipment.

200 DEFINITIONS

201 BIOMASS: Any organic material not derived from fossil fuels, such as agricultural

crop residues, bark, lawn, yard and garden clippings, leaves, silvicultural residue, tree

and brush pruning, wood and wood chips, and wood waste, including these materials

when separated from other waste streams. Biomass does not include material

containing sewage sludge, industrial sludge, medical waste, hazardous waste, or

radioactive waste.

202 BIOMASS FUELED BOILER (BOILER): Any combustion equipment designed

to burn biomass to produce steam, heat water or other fluids, and/or produce

electricity, including but not limited to boilers and steam generators.

203 BLOCK 24-HOUR AVERAGE: the arithmetic average of the hourly NOx or CO

emission rates of a unit as measured over 24 one-hour periods, daily, from 12:00 AM

to 11:59 PM, excluding periods of system calibration.

204 BRITISH THERMAL UNIT (BTU): The amount of heat required to raise the
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temperature of one pound of water from 59 degrees Fahrenheit to 60 degrees

Fahrenheit at one atmosphere.

205 CARBON MONOXIDE (CO) EMISSIONS: Carbon monoxide in the flue gas.

206 CURING STARTUP: A startup which includes heating the boiler at a

predetermined rate and holding the temperature at several points to allow for

insulating materials to cure in the boiler refractory.

207 HEAT INPUT: The chemical heat released due to fuel combustion in a unit, using

the higher heating value of the fuel. This does not include the sensible heat of

incoming combustion air.

208 HIGHER HEATING VALUE (HHV): The total heat liberated per mass of fuel

burned (BTU per pound), when fuel and dry air at standard conditions undergo

complete combustion and all resultant products are brought to their standard states

at standard conditions.

209 NITROGEN OXIDE (NOx) EMISSIONS: The sum of nitric oxides and nitrogen

diox 2ide in the flue gas, collectively expressed as nitrogen dioxide (NO ).

210 RATED HEAT INPUT: The heat input capacity, in million BTU per hour, specified

on the nameplate of the unit. If the unit has been altered or modified such that the

maximum heat input is different than the heat input capacity specified on the

nameplate, the maximum heat input shall be considered as the rated heat input.

211 SHUTDOWN: The period of time when fuel feed is curtailed and the unit cools

down from it’s normal operating temperature, to an ambient temperature.

212 STARTUP: The period of time that a unit is heated to the normal operating

temperature, from a shutdown status.

213 UNIT: Any biomass fueled boiler, as defined in section 202.

300 STANDARDS

301 EMISSION LIMITS: The owner/operator of an affected unit shall limit the

emissions of that unit to less than the following, excluding startup/shutdown:

NOx CO

90 ppm, corrected to 3% O2 

(block 24 hour average)

400 ppm, corrected to 3% O2 

 (block 24 hour average)
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302 STARTUP/SHUTDOWN PROVISIONS: The emission limits of section 301 shall

not apply during startup/shutdown, provided the following requirements are met:

302.1 A normal startup shall not exceed 24 hoursin duration. A curing startup shall

not exceed 96 hours in duration.

302.2 A shutdown shall not exceed 24 hours.

302.3 The frequency and duration of startup/shutdown periods and their associated

emissions shall be minimized as much as technologically feasible.

303 CONTINUOUS EMISSION MONITORING SYSTEM (CEMS): The

owner/operator of an affected unit shall install, calibrate, maintain, and operate a

Continuous Emission Monitoring System (CEMS) for measuring NOx and CO

emission concentrations.

303.1 The CEMS shall comply with the requirements specified in 40 Code of

Federal Regulations (CFR) Part 60, Appendix B, Specification 2 and

Appendix F or other alternative methods approved by the U.S. EPA and the

District.

304 SOURCE TESTING: The owner/operator of an affected unit subject to the

provisions of this rule shall perform a Relative Accuracy Test Audit (RATA) to

verify compliance with 40 CFR Part 60, Appendix F at least once every four (4)

calendar quarters, in accordance with a District-approved protocol and the procedures

listed in Appendix F.

400 ADMINISTRATIVE REQUIREMENTS

401 COMPLIANCE SCHEDULE: The owner/operator of an affected unit subject to

the requirements of this rule shall demonstrate full compliance with all provisions by

July 1, 2011.

402 CEMS OPERATING AND MAINTENANCE (O&M) PLAN: The

owner/operator of an affected unit shall submit an O&M Plan for the CEMS to the

Air Pollution Control Officer (APCO) for approval. The plan shall include:

402.1 The procedures for collecting and recording required data and other

information in a form approved by the APCO. 

402.2 The procedures and schedules for preventive and corrective maintenance

performed for the purpose of maintaining the CEMS in proper operating

condition.
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500 REPORTING AND RECORDKEEPING

501 REPORTING: All records required by this Rule shall be maintained on-site for a

period of five (5) years and made available to the APCO upon request.

502 RECORDKEEPING: The owner/operator of an affected unit shall maintain an

operating log for the unit that includes, on a daily basis:

502.1 The actual startup/shutdown time and total operating hours;

502.2. Type and amount of each biomass fuel burned;

502.3 The exhaust gas CO and NOx concentrations in parts per million volume

(ppmv), corrected to 3% O2, for block 24-hour average.

600 TEST METHODS

601 GENERAL: For the purposes of this Rule, the following test methods (or their most

recent approved versions) shall be used. Other alternative test methods that are

approved in writing by the District and the EPA may also be used.

602 NOx EMISSION CONCENTRATION: NOx emission concentrations shall be

determined in accordance with U.S. EPA Method 7.

603 CO EMISSION CONCENTRATION: CO emission concentrations shall be

determined in accordance with U.S. EPA Method 10.

604 STACK GAS OXYGEN: The oxygen content of the stack gas shall be determined

in accordance with U.S. EPA Method 3.

605 STACK GAS VELOCITY (FLOW): Velocity of the stack gases shall be

determined in accordance with U.S. EPA Method 2.

606 STACK GAS MOISTURE CONTENT: Moisture content of the stack gases shall

be determined in accordance with U.S. EPA Method 4.

607 FUEL HHV: The HHV of solid fuels shall be determined in accordance with ASTM

E 711-87 or ASTM D 2015-96.